I imagine if they've done green, blue, and purple, that the system is probably relatively dynamic and likely capable of the full rainbow and also multiple colours at the same time.
Wasn't until the crown lighting that I really noticed, but you can see it from the NW, particularly 5/6 Ave in Hillhurst & coming down the hill on 14 ST. Little treat since it's more or less hidden from other angles.
I believe that the top might be able to change colours to go along with the lights at the base of the tower that seems to mimic the Northern Lights, the interior of the building and as well as some of the ground work out front of the building is yet to be finished so it is possible that the crown lighting or the crown itself might still have some minor details to work out. Im still holding out hope that it'll end up changing colours to blue/green to go along with the base. But only time will tell...